A micron-sized GMR sensor with a CoCrPt hard bias  

作　　者：郑洋 曲炳郡 刘晰 韦丹 魏福林 任天令 刘理天 

机构地区：[1]Institute of Microelectronics,Tsinghua University [2]Key Laboratory of Magnetism and Magnetic Materials,Research Institute of Magnetic Materials,Lanzhou University [3]Laboratory of Advanced Materials,Department of Materials Science and Engineering,Tsinghua University

出　　处：《Journal of Semiconductors》2010年第2期19-22,共4页半导体学报（英文版）

摘　　要：A GMR（giant magneto-resistive） spin valve sensor for magnetic recording has been designed in an attempt to solve the Barkhausen noise problem in small-sized GMR sensors.In this study,the GMR ratio of the top-pinned spin valve is optimized to a value of 13.2%.The free layer is magnetized perpendicular to the pinned layer by a CoCrPt permanent magnetic bias so that a linear magnetic field response can be obtained.An obvious improvement on performance is observed when the permanent magnetic bias is magnetized,while the GMR sensor has a steadier MR-H loop and a smaller coercive field.A GMR（giant magneto-resistive） spin valve sensor for magnetic recording has been designed in an attempt to solve the Barkhausen noise problem in small-sized GMR sensors.In this study,the GMR ratio of the top-pinned spin valve is optimized to a value of 13.2%.The free layer is magnetized perpendicular to the pinned layer by a CoCrPt permanent magnetic bias so that a linear magnetic field response can be obtained.An obvious improvement on performance is observed when the permanent magnetic bias is magnetized,while the GMR sensor has a steadier MR-H loop and a smaller coercive field.

关 键 词：GMR SPIN-VALVE magnetic stabilization Barkhausen noise 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] TG146.21[自动化与计算机技术—控制科学与工程]